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Topic: Matching mouse clicks to 3D co-ords (Read 3784 times)

I'm writing an applet where an insect follows mouse clicks.The camera follows the insect from behind (height -240, distance 300).To save valuable processing time the flat (ie Y=0) landscape is rendered as one big square with a texture on it.I can use Interact2D to find the landscape, but how do I get more precise x,y,z 3D co-ords from the 2D (x,y) where the user clicked? I know the y will be 0 but I'm not good enough at maths to work out how to get x & z! The only way I can think of is breaking the landscape into lots of polys and using Interact2D, but this would play havoc with my processing time!Can you help?